This function will return a Unix timestamp corresponding to the Julian Day given in jday or FALSE if jday is not inside the Unix epoch (Gregorian years between 1970 and 2037 or 2440588 < jday < 2465342 ). The time returned is localtime (and not GMT).
Required. A julian day number between 2440588 and 2465342.
The unix timestamp for the start of the given julian day.